KR20220053649A - Method of making computer model for abutment and method of manufacturing abutment - Google Patents

Abstract

The present invention relates to a method for generating via a computer (3) a three-dimensional computer model (1) of an abutment (2) for a dental implant (12) for a specific patient, the abutment (2) comprising at least one base (4) ), a connecting structure (5), a coronal platform surface (6) and a screw channel (7), the method comprising the following steps: a three-dimensional representation of the patient's jaw readable by a computer (3) providing (10), - selecting a definition of the manufacturing margin along the individual gumline of the patient, - defining the three-dimensional shape of the abutment (2) above the manufacturing margin by an operator or algorithm of the computer (3) defining the appearance contour E of the abutment 2 by an operator or algorithm of the computer 3 , providing a three-dimensional computer model 1 by the computer 3 , , the plate-like design of the platform surface 6 is provided below the manufacturing margin for the three-dimensional shape of the platform.

Description

Method of making computer model for abutment and method of manufacturing abutment

The present invention provides a method for manufacturing an abutment and a method having the features of the classified parts of claims 1 and/or 2, as well as a computer program product, a computer readable storage medium, a computer readable data carrier for carrying such a computer program product and a data carrier signal and a computer configured to perform one of these methods and/or to execute such a computer program product.

The term abutment (which may sometimes also be referred to as an “attachment”) is used in dentistry to denote a connecting element between a pin-shaped dental implant and a prosthetic fitting (eg, single tooth part, bridge part, denture, etc.). used to The connection to the prosthetic fitting can be effected either directly or by a mesostructure.

Abutments can be found in EP 2 825 124 B1. The abutment disclosed in this document includes a platform comprising a plate-like configuration of a coronal platform surface that promotes cell growth and enables supporting mesostructures or prosthetic fittings on a coronal looking platform surface. The possibility of subsequent treatment of the abutment provides the possibility of individualization of the abutment for a particular patient.

The term emergence profile is used in dental implant treatment to indicate the three-dimensional configuration of the gingiva to which the abutment is to be placed, in the region of coronal extension from the dental implant to the gingiva line.

In addition to prefabricated standard abutments that must be manually retracted in a dental laboratory through a complex and expensive procedure to adapt the abutment to specific factors in the treatment position within the patient's jaw, the company directly produces patient-individualized abutments. that is already known This is done by means of a patient-specific abutment that will be created via a computer-readable three-dimensional computer module. The three-dimensional computer model is generated based on a digitized analog dental implant of the patient's jaw or provided directly in digital form (eg using an oral scanner or laboratory scanner).

An individualized gingival configuration for a patient is defined by an algorithm or operator (eg, a dental technician or dentist) on which the abutment will be placed.

In addition, the three-dimensional shape of the abutment above the preparation limit predetermined by the individual gingival configuration must be defined by the operator or algorithm. The definition of the three-dimensional shape of the abutment may include:

- Define the position of the screw passage extending from the abutment to secure the abutment to the pin-shaped dental implant. In general, this position is defined relative to the orientation of the dental implant.

- Define the width of the coronal platform surface of the abutment.

- Define the height of the abutment.

- define the width of the central ridge of the abutment with the screw passage;

Also, the appearance profile of the abutment must be defined by a computer operator or algorithm.

The emergence contour, i.e., the external shape of the abutment below the manufacturing limit up to the pin-shaped dental implant, was predetermined in standard form, and the area between the emergence contour and the screw passageway was defined as the filled body, where the computer operator There was absolutely no room for manipulation. As a result, manufacturing limits that extend too deeply on their own to expand the realm that can be selected or defined by an operator or algorithm are often adopted in practice. This entails the problem that the so-called adhesive joint between the abutment and the prosthetic fitting is displaced in the direction of the dental implant, resulting in the destructive result of the patient's jawbone to the gingiva and jawbone.

It is an object of the present invention to use a computer to provide a three-dimensional computer model of an intended patient-specific abutment for a dental implant patient and a computer model for a dental implant that is better compatible with the patient's gingiva and jawbone, or the abutment produced accordingly. To provide a method for producing abutments.

The object is achieved by a method comprising the features of claim 1 and/or 2 and a method comprising the features of claim 7 .

The present invention also relates to a computer program product comprising instructions for performing a method, a computer readable storage medium comprising such instructions and a computer readable data carrier, as well as a data carrier signal for carrying such a computer program product and to the present invention. It is intended to provide a computer for performing one of the methods according to the invention and/or for executing a computer program product according to the invention.

The object is a computer program product comprising the features of claim 8 , a computer readable storage medium comprising the features of claim 9 , a computer readable data carrier comprising the features of claim 10 , a data carrier signal comprising the features of claim 11 . and the features of claim 12 .

The steps of the method according to the invention are carried out outside the patient's body, since the invention starts with an already existing three-dimensional representation of the patient's jaw, at least in the jaw region in which the abutment is to be placed.

Advantageous embodiments of the invention are defined in the dependent claims.

According to a first variant of the invention, as known from EP 2 825 124 B1, the plate-like configuration of the surface of the tubular platform is provided below the manufacturing limits of the three-dimensional geometry of the platform. The plate-like configuration includes an adhesive joint between the abutment and the prosthetic fitting that is advantageously spaced away from the dental implant. Since it is further provided that the material thickness of the platform of the abutment is selected by the computer operator for a defined emergence profile, ie starting below the manufacturing limit, the computer operator can manufacture manufacturing that extends too deeply on its own to increase his operating space. You no longer have to choose a limit. Thus, the present invention allows the operator to pre-design the three-dimensional shape of the abutment below manufacturing limits. In order to avoid a detrimental configuration here and to avoid a configuration that can lead to failure of the abutment in the case of an abutment generated according to a three-dimensional computer model provided by a computer, the present invention provides a predetermined area in which the three-dimensional shape of the abutment is stored in an electronic memory. Only within the limits of manufacturing it provides that it can be selected by the operator.

The plate-like configuration of the surface of the tubular platform would suffice by itself. However, there is also preferably the lower surface of the platform (the surface of the platform displaced from the tubular platform surface by the thickness of the material), which is of a tubularly curved configuration.

The present invention relates to the production of abutments below manufacturing limits, at least within the range of which the operator can select a material thickness for the platform of the abutment starting from a defined emergence profile (i.e. the normal distance between the coronal platform surface and the platform surface remote therefrom). It provides that the three-dimensional shape can be selected by the operator.

In a preferred embodiment, the present invention provides that the three-dimensional shape of the abutment below the manufacturing limit can be further selected by the operator to the extent that the computer operator selects below.

- the material thickness of the screw passage wall (i.e. the normal distance between the inner wall defining the screw passage and the wall away from the inner wall of the coronal extension region of the abutment with the screw passage) and/or

- the material thickness of the base of the abutment (ie the normal distance between the outside of the abutment opposite the connecting structure and the coronal platform surface), and/or

- a transition radius within a predetermined range stored in the electronic memory in case of transition between the coronal platform surface and the base of the abutment and/or between the base of the abutment and the wall of the screw passage.

It should be noted that a constant material thickness is preferred for the material thickness of the abutment platform and/or the material thickness of the screw passage walls and/or the material thickness of the base of the abutment. However, in principle, there may be a gradient for one or more of these material thicknesses (variable material thicknesses). The gradient may be defined by predetermining one or more support points.

Each range of possible choices of material thickness or turning radius is preferably selected according to the material to be used for the abutment (eg ceramic, titanium, plastic or hybrid material) and/or the defined three-dimensional shape of the abutment above the manufacturing limits. Do.

The predetermined ranges stored in the electronic memory (at least which the computer can naturally access during execution of the method at that stage) may be established based on empirical values and/or simulations and/or measurement series, respectively. or. For example, the material thickness can be provided as follows.

- the thickness of the base of the abutment can be selected from the range of about 0.05 mm to about 4 mm,

- the thickness of the platform can be selected in the range of about 0.05 mm to about 2 mm,

- The thickness of the wall of the screw passage may be selected in the range of about 0.05 mm to about 3 mm.

Preferably, the method upon program execution by the computer for directly providing a three-dimensional computer model for the abutment comprising a coronal platform surface in a plate-like configuration starting from a computer-provided three-dimensional representation of the patient's jaw. and causing the computer program to perform the method.

However, alternatively, in the second modification of the present invention, it may be provided that first, a three-dimensional starting computer model of an abutment suitable for an individual patient is generated by a conventional method and a corresponding computer program. This abutment model is a form in which the radially extending area between the screw passage of the abutment and the emergence profile of the abutment is represented as being filled with material. The computer then carries out the transformation using the method according to the invention or the corresponding computer program according to the invention to obtain a three-dimensional computer model from the three-dimensional starting computer model. This three-dimensional model consists of the material thickness of the platform of the abutment, which is provided below the manufacturing limits for the three-dimensional shape of the platform as a plate-like configuration of the tubular platform surface and selected by a computer operator based on the defined emergence contours. The same optional features as discussed in connection with the first variant of the invention may additionally be provided.

Preferably, the additive manufacturing method (eg laser sintering), in which a powder (eg ceramic, titanium, plastic or hybrid material) is cured layer by layer by the action of energy, comprises a three-dimensional computer model with reduced material of the individualized patient abutment - This model is proposed for the production of an abutment according to the invention for a dental implant using - manufactured according to a method according to at least one of the preceding embodiments.

Compared with conventional machining or cutting methods for the production of abutments, the additive manufacturing method is distinguished in that the working time is shortened. In addition, machining or cutting methods often require complex re-clamping operations. Machining or cutting post-processing may also be required when using additive manufacturing methods.

In all embodiments the screw passages may extend parallel or obliquely to the central notional axis of the connecting structure of the abutment.

Embodiments of the present invention are further described below with reference to the drawings.
1a and 1b show schematic views of two variants of an arrangement for carrying out the method according to the invention;
Fig. 2 shows a schematic diagram of a method for manufacturing an abutment using the results of the method shown in Fig. 1a or 1b;
3A-3D show various views and cross-sectional views of an embodiment of an abutment to be manufactured according to the present invention.
FIG. 4 shows a cross-sectional view in which the dimension of the material thickness is measured as in FIG. 3D .
Figures 5a to 5d show various views and cross-sectional views representing an embodiment of a three-dimensional starting computer model of an individual patient abutment to be transformed during a method according to the invention;
6 shows a cross-sectional view through an embodiment of an abutment to be manufactured according to the present invention, in a second variant of the present invention, starting from a three-dimensional starting computer model it is possible to see how the transformation is effected.
7a to 7d are computer-readable three-dimensional views of a patient's jaw with a computer model of the abutment or the patient's jaw without abutment and an abutment manufactured by the method according to the invention having a prosthetic fitting in the form of a gingival mask and crown; The drawing shows.

1a schematically shows an apparatus for operating a method for manufacturing a three-dimensional computer model 1 of a patient-specific abutment 2 for a dental implant 12 via a computer 3 , wherein: The abutment 2 (see FIGS. 3a to 3d) is

- base (4),

- a connecting structure 5 (see Fig. 7(b)) for connecting the abutment 2 to the pin-shaped dental implant 12;

- the coronal platform surface 6 of the platform of the abutment 2 for supporting the prosthetic fitting, and

- screw passages (7) for fixing the abutment (2) to the pin-shaped dental implant (12)

to provide

The central nominal axis Z of the connecting structure 5 of the abutment 2 can be seen here.

The procedure involves providing a three-dimensional representation 10 readable by the computer 3 of the patient's jaw, at least in the jaw region where the abutment 2 is to be placed. This three-dimensional representation may be based on a known manner, ie a digitized dental imprint of the patient's jaw, or directly generated in digital form (eg using an oral scanner and/or laboratory scanner).

In a known manner, the selection of the definition of the manufacturing limit according to the specific gingival configuration for the patient is effected by the operator or algorithm of the computer 3 at the position where the abutment 2 is to be placed.

The definition of the three-dimensional shape of the abutment 2 above the manufacturing limit is implemented by an operator or algorithm of the computer 3 . The three-dimensional shape of the abutment 2 may include:

- define the position of the screw passage 7 extending from the abutment 2 for fixing the abutment 2 to the pin-shaped dental implant 12 . Generally this position is defined relative to the orientation of the pin-shaped dental implant 12 .

- define the width of the tubular platform surface 6 of the abutment 2;

- Define the height of the abutment (2).

- define the width of the central ridge of the abutment (2) holding the screw passage;

The definition of the appearance contour E of the abutment is influenced by the operator or algorithm of the computer 3 .

According to the invention, below the manufacturing limits for the three-dimensional shape of the platform, a plate-shaped configuration of the tubular platform surface 6 is provided.

The operator of the computer 3 selects the following on the basis of the appearance contour E defined within a predetermined area stored in the electronic memory 8 (see FIGS. 4 and 6 ).

- material thickness d ₁ of the platform of the abutment (2),

- the material thickness d _{2 of the base of the abutment 2} and/or

- material thickness d ₃ of the wall of the screw passage 7 and/or

- a transition radius R ₁ for transition between the tubular platform surface 6 and the base 4 of the abutment 2 , and

- transition radius R ₂ for transition between the base of the abutment (2) and the wall of the screw passage (7)

The three-dimensional computer model 1 is provided by the computer 3 , for example using a three-dimensional computer model 1 manufactured according to the method described above for a patient-specific abutment for the dental implant 12 . In order to produce (2), it is preferably provided by an additive manufacturing method.

The embodiment of Fig. 1b shows that, according to a second variant of the invention, first a three-dimensional starting computer model 9 of the abutment 2 tailored to the individual patient is first provided with a three-dimensional representation of the jaw, the definition and production of the appearance contour E. It differs from the above-described embodiment only in that it is manufactured according to the three-dimensional shape of the abutment 2 above the limit, in which the three-dimensional starting computer model 9 is the screw passage 10 of the abutment and the appearance of the abutment 2 . The area extending radially between the contours E is of the shape indicated as being filled with a material (see Figs. 5a to 5d). Starting from this three-dimensional starting computer model 9 (which itself represents a functional abutment), the computer 3 shows that the plate-shaped configuration of the tubular platform surface 6 exists below the manufacturing limits for the three-dimensional shape of the platform. and _an algorithm (e.g., the algorithm is and calculating the required specific material thickness according to the load peak calculated according to each inclination of the passage), said material thickness being determined by the operator of the computer 3 on the basis of the defined appearance contour E is chosen Fig. 6 is an illustration in which regions shown as filled with material (dotted regions) can be removed in a transform operation.

Fig. 7(a) shows a diagram of a three-dimensional representation 10 of a patient's jaw readable by a stereoscopic computer 3 comprising a three-dimensional computer model 1 of abutment teeth 2 tailored to the individual patient.

In FIG. 7(b) , the abutment 2 shown in FIG. 7(a) is removed, allowing the upper region of the pin-shaped dental implant 12 to be visible. The abutment 2 is inserted in the upper region of the pin-shaped dental implant 12 together with the connecting structure 5 . Fig. 7(c) shows a gingival mask (but not provided in Figs. 7(a) and 7(b)).

Fig. 7(d) shows an abutment 2 made according to the method of the invention with a prosthetic fitting in the form of a crown.

1 3D computer model of abutment for each patient
2 abutment
3 computer
4 Base of the abutment
5 connection structure
6 tubular platform surface
7 screw passage
8 electronic memory
9 3D starting computer model of abutment for each patient
10 3D representation of the patient's jaw
11 production equipment
12 dental implants
E contour of the appearance of the abutment
Center nominal axis of the connecting structure of the Z abutment
d ₁ material thickness of the platform of the abutment
d ₂ material thickness of the base of the abutment
d ₃ material thickness of the wall of the screw passage of the abutment
R ₁ Radius of transition between the surface of the coronal platform and the base of the abutment
R ₂ Radius of transition between the base of the abutment and the wall of the screw passage

Claims (12)

A method for generating a three-dimensional computer model (1) of an abutment (2) for a dental implant (12) using a computer (3), which is tailored to the individual patient specific to the patient, the method comprising:
The abutment (2) comprises at least a base (4), a connecting structure (5) for connecting the abutment (2) and the pin-shaped dental implant (12), and the abutment (2) for supporting a prosthetic fitting. Having a coronal looking platform surface 6 of the platform, and a screw passage 7 for fixing the abutment 2 to the pin-shaped dental implant 12, the following steps:
- providing a three-dimensional representation (10) readable by the computer (3) of the patient's jaw at least in the corresponding region of the jaw in which the abutment (2) is to be placed;
- selecting, by an operator or algorithm of the computer (3), a definition of manufacturing limits according to the individual gingival configuration of the patient in which the abutment (2) is to be placed;
- defining, by an operator or algorithm of said computer (3), the three-dimensional shape of said abutment (2) above said manufacturing limits;
- defining, by an operator or algorithm of said computer (3), an appearance contour (E) of said abutment (2), and
- providing said three-dimensional computer model (1) by said computer (3),
Below the manufacturing limit for the three-dimensional shape of the platform is provided the plate-like structure of the tubular platform surface 6 , the material thickness d ₁ of the platform of the abutment 2 being, the electronic memory 8 Method, characterized in that it is selected by the operator of the computer (3) starting from the defined appearance contours (E) within a predetermined range stored in A method for generating a three-dimensional computer model (1) of an abutment (2) for a dental implant (12) using a computer (3), which is tailored to the individual patient specific to the patient, the method comprising:
The three-dimensional starting computer model 9 comprises a base 4, a connecting structure 5 for connecting the abutment 2 to the pin-shaped dental implant 12, and the abutment for supporting a prosthetic fitting ( 2) shows the abutment (2) having a coronal platform surface (6) of the platform, and a screw passage (7) for fixing the abutment (2) to the pin-shaped dental implant (12), the following steps , In other words,
- providing a three-dimensional starting computer model (9) of the abutment (2) tailored to the individual patient; - The three-dimensional starting computer model (9) comprises: A region extending radially between the appearance contours (E) of (2) is of the form indicated as being filled with a material - and
- a plate-shaped configuration of the tubular platform surface 6 is provided below the manufacturing limits for the three-dimensional shape of the platform, starting from the defined emergence contour E within a predetermined range stored in the electronic memory 8 to obtain the three-dimensional computer model 1 from the three-dimensional starting computer model 9 including the material thickness d ₁ of the platform of the abutment 2 selected by the operator of the computer 3 by to perform the conversion by the computer (3)
How to include. 3. The method according to claim 1 or 2,
The method, wherein the material thickness d ₃ of the wall of the screw passage (7) is further selected by an operator of the computer (3) within a predetermined area stored in the electronic memory (8). 4. The method according to any one of claims 1 to 3,
The method, wherein the material thickness d ₂ of the base (4) of the abutment (2) is selected within a predetermined range stored in the electronic memory (8) by an operator of the computer (3). 5. The method of at least one of claims 1 to 4,
The turning radius R ₁ , R ₂ is, within a predetermined area stored in the electronic memory 8 ,
- switching between the tubular platform surface (6) and the base (4) of the abutment (2), and/or
- transition between the base 4 of the abutment 2 and the wall of the screw passage 7
The method chosen for. 6. The method of at least one of claims 1 to 5,
The respective ranges for the possible selection of the material thicknesses d ₁ , d ₂ , d ₃ and/or the turning radii R ₁ , R ₂ are the material used for the abutment 2 and/or the manufacturing limits respectively selected according to the defined three-dimensional shape of the abutment (2) above. A method for manufacturing an individual patient abutment (2) for a dental implant (12) using a three-dimensional computer model (1) manufactured according to the method specified in any one of claims 1 to 6, preferably A method produced by an additive manufacturing method. A computer program product comprising instructions which, when the program is executed by a computer (4), cause it to carry out the method according to at least one of claims 1 to 6. A computer-readable storage medium comprising instructions that, when executed by a computer (4), cause the program to perform a method according to at least one of claims 1 to 6. A computer readable data carrier on which the computer program product of claim 8 is stored. A data carrier signal for transmitting the computer program product according to claim 8 . A computer configured to perform a method according to at least one of claims 1 to 7 and/or to perform a computer program product according to claim 8.

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